Crushing-rolls.



No. 741,892." PATENTED 00T. zo, 190s.

Y W. G. Donn.

GRUSHING ROLLS.

`...1=P1.I0J\r1o1v.FILED MAY 1, 1901. No norm.. i Y 'z SHEETS-SHEET 1.

.. w. w mm( 'will u 17 No. 741,892. PATENTED OCT. 20, 1903. W. G. DODD.

@RUSHING ROLLS.

APPLIOATION FILED MAY 1, 1901. No MODEL. 2 SHEETS-SHEET 2.-

ivo. 741,892.

Patented October 20, 1903.

Fries.

WILLIS G. DODD, OF SAN FRANCISCO, CALIFORNIA.

cRusHlNGl-ROLLS. l

SPECIFICATION forming part of Letters Patent N o. 741,892, dated October 20, 1903. Application led May 1,'1901i Serial No. 58,270. (No model.)

To all whom it may 4concern:

Be it known that I, WILLIS G. DODD, a citizen of the United States, residing in the city and county of San Francisco, State of California, have invented certain new and useful Improvements in Crushing-Rolls; and I do hereby declare lthe following to be a full, clear, and exact description of the same.

The present invention relates more particularly to that class of" crushing machinery known as cornish-rolls,7 usually employed for the crushing or pulverization of stone, quartz, or metal-bearing ores; and the invention resides more especially in the novel construction of the supporting mechanism for the crushing-rolls, whereby the heavy supporting frame or base ordinarily used in con` nection with this class of machinery is dispensed with. Heretofore crushing rolls of this class have been constructed with a heavy or massive supporting frame or base on which one of the crushing-rolls is mounted in rigid journal-brackets, the other crushing-roll being mounted in sliding or adjustable bearingbrackets. Inasmuch as the rolls when crushing ore develop severe strains and are sub-- jected to heavy shocks, it is required, as one of the rolls is rigidly connected, that the supporting frame or base be of sufficient strength d to withstand the strains and shocks thus produced. For this reason a massive supporting frame or base has been found necessary for crushing-rolls of this character.

The main object of the present invention is to dispense with the necessity of employing this heavy supporting frame or base and to so construct the supporting means for the crushing-rolls that the strains and shocks will be evenly distributed and taken up by the tensionrods- The wearing parts of the rolls consist of the tires or shells fastened to the roll-centers. These tires are of steel and are usually from two and one-half inches to three inches in thickness, and in constant service they last but a short time. As they wear away the standard distance between the crushing-rolls must be maintained. Where one of the crushing-rolls is mounted in sliding or ad- 5o justable bearing-brackets and the opposing roll in fixed bearing-brackets, there is an un- LA: further object of the present invention resides in permitting each roll to adj ust itself proportionately to the wear of the tires and distributing the Wearequally between the tires and to maintaining the standard distance between the crushing-faces of the rolls.

A further object of the invention is to obtain between the bearing-brackets an equal distribution of the severe strains, shocks, and jars producedwhile the machine is in operation, thus enabling the crushing-rolls to run steadily and in balance without the employment of a base-frame. i

A further object of the invention is the production of a comparatively light and inexpensive crushing apparatus, one that may be readily taken apart and set up for operation` and a machine which may be conveniently transported from place to place or into mountainous regions.

In order to comprehend the invention, reference should be had to the accompanying sheets of drawings, Wherein- Figure 1 is a side View of the crushing-roll in 'working position. Fig. 2 is a top plan View of the mechanism disclosedby Fig. l of the drawings. Fig. 3 is an end view in elevation of the machine. Fig. 4 is an irregular cross-sectional vieuT in elevation taken on line o; w, Fig. 2. Fig. 5 is an enlarged detail sectional view of one of the bearing-brackets, disclosing one of the crushing-rolls, journalbox therein, and tension-rods upon which the bearing-bracket is mounted; and Fig. G is a perspective View of one of the spaceplates for holding the bearing-brackets apart.

The numerals l 2 are used to indicate the crushing-rolls, which rolls aresecured to or form a part of the shafts 3 4, respectively.

bearing-brackets 7 S, being held in place by cap 9. Each journal-box is formed with a convex face portion 10, which rests within the concave circular seat 11 in the head of the bearing-brackets. By means of the conveX face of the journal-boxes the same are permitted to swing or oscillate within the bearing-brackets, although prevented from rotation by means of the set-screw 12. This set-screw projects through the cap 9 of the bearing-brackets and rests within the transverse groove 13, cut in each journal-box, Fig. 4 of the drawings. The bearing-brackets are slidably mounted upon the tension-rods ab, being held thereon by collars 14. Between these collars and the outer end ot the bearing-brackets are interposed the heavy springs 15. These springs maintain a constant inward pressure upon the bearingbrackets and hold the same together. The bearing-brackets are held apart at the center of the tension-rods by the space-plates 16, which plates are cut away, as shown at b3, Fig. 6, so as to straddle the tension bars or rods a b, and said plates are held together by means of a longitudinal bolt passed through the opening b of the plates. By means of these space-plates the bearing-brackets are held apart a given distance, sufficient to maintain the faces or tires h2 of the crushing-rolls separated. The projecting ends of the tension-rods are united by the cross-tie plates or supports 17 18, Fig. 2.

When the parts are arranged as described, the crushing-rolls are adapted for the work of crushing stone, quartz, or ore, the only requirement being that the cross-tie plates be bolted or otherwise anchored. In Fig. 1 of the drawings these cross-tie plates are illustrated as being secured to permanent foundations or pillars 19. However, this feature is immaterial, as the cross-tie plates may be bolted to beams having sufficient height to clear the crushing-rolls of the ground.

Each roller-shaft is provided with a beltwheel 20, which is driven from any suitable source of power by means of a belt. (Not shown.)

As the periphery or tires of the crushingrolls wear away the said rolls are forced inward by the pressure of the springs 15, so as to maintain a standard distance between the crushing-surfaces. The pressure of these springs acts upon the crushing-rolls through the medium of the slide bearing-bracket, and

the inward movement of these is limited by the space-plates. Consequently to compensate for the frictional wear of the tires it is only required to remove the space-plates one at a time as the weartakes place. For instance, eight space-plates are indicated interposed between the bearing-brackets. The thickness of each tire is, say,two and one-half inches or total tire thickness of five inches. After live-eighths of an inch of the tire thickness have worn away one space-plate, which is ve-eighths of an inch thick, is removed. In this manner the relative position of the crushing-rolls is maintained throughout the life of 'the tires or wearing-surfaces. AInasmuch as each crushing-roll is mounted to rotate in sliding bearing-brackets, the strains, jars, or shocks of the rolls will be equally distributed between the said brackets, which is ynot the case where one crushing-roll is rigid and the opposing roll movable longitudinally. Again, the crushing pressure is equally distributed between the rolls and the rolls permitted to run steadier, smoother, and more evenly balanced where the rolls are independently movable upon the tension-rods. By reason of the concavo-convex bearing for the journal boxes the crushing-rolls are permitted to tilt or swing, if so desired, during the operation of crushing.

In this class of machinery it is required for successful work that the feed-hopper be so arranged as to deliver the ore to be crushed directly over the center or between the crushing-rolls. Where one crushing-roll is a liXed Vone and the opposing roll mounted in slidable -bearing-brackets, it is necessary as said movable roll is adjusted to compensatefor wear of the tires that the position of the feed-hopper be changed, else the feed of the material 'to be crushed will not be over the center or -between the crushing-faces of the rolls, but

to one side thereof. This adjustment of the feed-hopper I desire to overcome, as it requires much time to so adjust. This I accomplish by mounting each roll in the selfadjustable or slidable bearing brackets.

When thus mounted, the wear of the tires is evenly distributed between the crushing-rolls,

Consequently the Thus it is wear is automatically taken up by the selfadjustment of the rolls.

To dismantle the machine for transporta- Ation or other purposes, it is only required that the cross-tie plates be removed and the rolls released by unfastening the caps 9. The rolls may then be removed or separated from the bearing-brackets. If desired to separate the bearing-brackets, the tension-rods are removed from the cross-tie plates and the collars 14 released. The bearing-brackets may then be slipped from O the tension-rods and the parts readily packed for shipment or trans- `portation.

Having thus described the invention, what is claimed as new, and desired to be protected by Letters Patent, is-

In a roller-Crusher, the combination with the grinding-rolls, of separated rods arranged IOO IIO

bearings carried by said brackets upon which the crushing-rolls are suspended.

In witness whereof I have hereunto set my hand.

YVILLIS G. DODD.

Witnesses:

LEE D. CRAIG, l N. A. ACKER. 

